from tkinter import *
ekv = []

#window setup
calc_body = Tk()
topframe= Frame(calc_body)
topframe.pack()
bottomframe = Frame(calc_body)
bottomframe.pack()

#button functions
def solver():
    ans = eval("".join(ekv))
    math_txt = ans
    math_entry.grid(row=0, column=1)

def math_lister(math):
    ekv.extend(math)
    math_txt = ekv
    math_entry.grid(row=0, column=1)
def number_0():
    math_lister("0")
def number_1():
    math_lister("1")
def number_2():
    math_lister("2")
def number_3():
    math_lister("3")
def number_4():
    math_lister("4")
def number_5():
    math_lister("5")
def number_6():
    math_lister("6")
def number_7():
    math_lister("7")
def number_8():
    math_lister("8")
def number_9():
    math_lister("9")
def number_add():
    math_lister("+")
def number_sub():
    math_lister("-")
def number_div():
    math_lister("/")
def number_mult():
    math_lister("*")

#labels and buttons
math_entry = Label(topframe, text=math_txt, bg= "white")
math_wintext = Label(topframe,text="Enter math:")
exe_button = Button(bottomframe,text="exe", command=solver)
button_0 = Button(bottomframe,text="0", command=number_0)
button_1 = Button(bottomframe,text="1", command=number_1)
button_2 = Button(bottomframe,text="2", command=number_2)
button_3 = Button(bottomframe,text="3", command=number_3)
button_4 = Button(bottomframe,text="4", command=number_4)
button_5 = Button(bottomframe,text="5", command=number_5)
button_6 = Button(bottomframe,text="6", command=number_6)
button_7 = Button(bottomframe,text="7", command=number_7)
button_8 = Button(bottomframe,text="8", command=number_8)
button_9 = Button(bottomframe,text="9", command=number_9)
button_add = Button(bottomframe,text="+", command=number_add)
button_sub = Button(bottomframe,text="-", command=number_sub)
button_div = Button(bottomframe,text="/", command=number_div)
button_mult = Button(bottomframe,text="*", command=number_mult)





#layout
button_0.grid(row=3,column=0,)
button_1.grid(row=2,column=0)
button_2.grid(row=2,column=1)
button_3.grid(row=2,column=2)
button_4.grid(row=1,column=0)
button_5.grid(row=1,column=1)
button_6.grid(row=1,column=2)
button_7.grid(row=0,column=0)
button_8.grid(row=0,column=1)
button_9.grid(row=0,column=2)
button_add.grid(row=0,column=3)
button_sub.grid(row=1,column=3)
button_div.grid(row=2,column=3)
button_mult.grid(row=3,column=2)
exe_button.grid(row=3,column=3)

math_wintext.grid(row=0,column=0, sticky=W)

calc_body.mainloop()